Question

Question 5 What is the difference between direct and indirect development?

Class XI Biology Chapter - Animal Kingdom Page 62

Answer 1

           Direct development: In case of direct development, the life cycle of an adult individual lacks any larval stage in its life cycle. The adults give rise to young ones which directly develop into the adult, e.g., Mammals.
          Indirect development :It is present mostly in case of lower animals, the adult individual gives rise to eggs mostly which develop into the adult after being passing through several larval stages e.g., Echinoderms, ascaris, cockroach have prolonged larval stages in their life cycle.

Answer 2

1 It is a type of development in which an embryo develops into a mature individual without involving a larval stage.
1.It is a type of development that involves a sexually-immature larval stage, having different food requirements than adults.


2Metamorphosis is absent.
2.Metamorphosis involving development of larva to a sexually-mature adult is present.


3,It occurs in fishes, reptiles, birds, and mammals.
3.It occurs in most of the invertebrates and amphibians.